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require "rghost/function"
require "rghost/ps_object"
# The postscript default unit is the 1/72th inch. RGhost uses the centimeters (cm) as it's default, mainly for positioning coordinates and numeric object sizes (if the size is a String, it won't be parsed to the default unit). This setting can be changed setting the value of RGhost::Config::GS[:unit] before the document is created using any of the Units child classes.
#===Example:
#
#====Setting to inches.
# RGhost::Config::GS[:unit]=Units::Inch
# doc.moveto :x => 1, :y => 2 #=> 1 inch x 2 inches
#====Explicitly setting to Cm.
# doc.moveto :x => '1 cm' , :y => '2 cm'
#====Using the Postscript unit
# doc.moveto :x => '100' , :y => '200'
module RGhost::Units
class Unit < RGhost::PsObject
attr_accessor :value
def initialize(value = 0)
@value = value
end
def ps
"#{@value} #{self.class.to_s.gsub("RGhost::Units::", "").downcase} "
end
def self.define
""
end
end
# n/72 * 2.545
class Cm < Unit
def self.define
Function.new("cm", "72 div 2.545 mul")
end
end
# n*72
class Inch < Unit
def self.define
RGhost::Function.new("inch", "72 mul")
end
end
class PSUnit < Unit
def ps
"#{@value} "
end
end
# Parses units
# Units::DEFAULT=Utits::Cm
# Units.parse(2) #=> "2 cm"
# Units.parse(:current_row) #=> "current_row"
# Units.parse("3 inch") #=> "3 inch"
# Units.parse("2") #=> "2"
#
# Using US metric
# Units::DEFAULT=Utits::Inch
# Units.parse(2) #=> "2 inch"
# Units.parse(:current_row) #=> "current_row"
# Units.parse("3 cm") #=> "3 cm"
# Units.parse("5") #=> "5"
def self.parse(value)
if value.is_a? Numeric
RGhost::Config::GS[:unit].new(value)
else
RGhost::PsObject.new(value)
end
end
end
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